Air-fuel ratio detector

Details Air-fuel ratio detector Air-fuel ratio detector

G - Physics

01

N

324/25, 341/38.1

G01N 27/406 (2006.01)

Patent

CA 1223041

-1- Abstract In an air-fuel ratio detector for use in the exhaust of an automobile, the air-fuel ratio in the lean range is detected by measuring a limiting current when oxygen diffused to a first electrode is pumped to a second elect trode via a solid electrolyte. A stoichiometric air-fuel ratio is detected from an electromotive force between first and third electrodes, when oxygen is pumped from the first electrode to a third electrode. The invention is characterized by use of these three electrodes. Furthermore, an air-fuel ratio in the rich range is detected by either sending oxygen from the first elect trode to the third electrode via the solid electrolyte and measuring a current when the electromotive force between the first and third electrodes is kept constant, or measuring a current when the air-fuel ratio range is judged as "rich" from this electromotive force, the polarity of the impressed voltage being reversed at the time of lean detection.

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